Display device

ABSTRACT

A display device includes: a substrate; a first pixel unit disposed over the substrate and including at least two pixel areas emitting lights of different colors; a second pixel unit neighboring the first pixel unit and including at least two pixel areas emitting lights of different colors; a first opposite electrode disposed on an area corresponding to the first pixel unit; and a second opposite electrode disposed on an area corresponding to the second pixel unit, wherein the first pixel unit includes a first pixel area and a second pixel area that neighbor each other, the second pixel unit includes a third pixel area and a fourth pixel area that neighbor each other, and a first distance between the first pixel area and the second pixel area is less than a second distance between the third pixel area and the first pixel area.

CROSS-REFERENCE TO RELATED APPLICATION

This application claims the benefit of Korean Patent Application No.10-2019-0062055, filed on May 27, 2019, in the Korean IntellectualProperty Office, the disclosure of which is incorporated herein in itsentirety by reference.

BACKGROUND 1. Field

One or more embodiments relate to a display device.

2. Description of Related Art

Recently, use of display devices has diversified. Also, as displaydevices have become more thinner and lighter, their range of use hasgradually been extended, and research into a display device that may beutilized in various fields is in constant progress.

SUMMARY

One or more embodiments include a display device.

Additional aspects will be set forth in part in the description whichfollows and, in part, will be apparent from the description, or may belearned by practice of the presented embodiments of the disclosure.

According to one or more embodiments, a display device includes: asubstrate; a first pixel unit disposed over the substrate and includingat least two pixel areas emitting lights of different colors; a secondpixel unit neighboring the first pixel unit and including at least twopixel areas emitting lights of different colors; a first oppositeelectrode disposed on an area corresponding to the first pixel unit; anda second opposite electrode disposed on an area corresponding to thesecond pixel unit, wherein the first pixel unit includes a first pixelarea that neighbors the second pixel unit and a second pixel area thatneighbor each other, the second pixel unit includes a third pixel areathat neighbors the first pixel unit and a fourth pixel area thatneighbor each other, and a first distance between the first pixel areaand the second pixel area is less than a second distance between thethird pixel area and the first pixel area

The first opposite electrode may be a single body covering the firstpixel area and the second pixel area, and the second opposite electrodeis a single body covering the third pixel area and the fourth pixel areathat neighbors the third pixel area.

An end portion of the first opposite electrode and an end portion of thesecond opposite electrode may overlap each other.

The end portion of the first opposite electrode may directly contact theend portion of the second opposite electrode.

An overlapping part of the end portion of the first opposite electrodeand the end portion of the second opposite electrode may be disposedbetween the first pixel area and the third pixel area.

The first opposite electrode and the second opposite electrode mayinclude the same material.

The display device may further include: a first pixel electrode disposedin the first pixel area, a second pixel electrode disposed in the secondpixel area, and a third pixel electrode disposed in the third pixelarea; and a pixel-defining layer including openings respectivelyoverlapping the first pixel electrode, the second pixel electrode, andthe third pixel electrode.

Each of an edge of the first opposite electrode and an edge of thesecond opposite electrode may be disposed on a top surface of a portionof the pixel-defining layer disposed between the first pixel electrodeand the third pixel electrode.

The substrate may include a transmissive area that neighbors the firstpixel unit and the second pixel unit, and the pixel-defining layer mayinclude a hole corresponding to the transmissive area.

An edge of one of the first opposite electrode and the second oppositeelectrode may neighbor an edge of the pixel-defining layer defining thehole.

According to one or more embodiments, a display device includes: asubstrate; a first pixel unit disposed over the substrate and includinga first pixel area and a second pixel area emitting lights of differentcolors; a second pixel unit neighboring the first pixel unit andincluding a third pixel area that neighbors the first pixel unit and afourth pixel area emitting lights of different colors; a first pixelelectrode disposed in the first pixel area; a second pixel electrodedisposed in the second pixel area that neighbors the first pixel area; athird pixel electrode disposed in the third pixel area; and apixel-defining layer including openings respectively overlapping thefirst pixel electrode, the second pixel electrode, and the third pixelelectrode, wherein a first width of a first potion of the pixel-defininglayer that is disposed between the first pixel electrode and an edge ofthe second pixel electrode may be less than a second width of a secondportion of the pixel-defining layer that is disposed between the firstpixel electrode and the third pixel electrode.

The display device may further include: a first opposite electrode and asecond opposite electrode that are disposed respectively correspondingto the first pixel unit and the second pixel unit, wherein the firstopposite electrode may be electrically connected to the second oppositeelectrode.

An end portion of the first opposite electrode and an end portion of thesecond opposite electrode may directly contact each other.

The end portion of the first opposite electrode and the end portion ofthe second opposite electrode may overlap each other.

A contact area of the first opposite electrode and the second oppositeelectrode may be disposed between the first pixel area and the thirdpixel area.

The first opposite electrode and the second opposite electrode mayinclude the same material.

The first opposite electrode and the second opposite electrode each mayinclude Ag, Mg, or an alloy of Ag and Mg.

A first gap between the first pixel electrode and the second pixelelectrode may be less than a second gap between the first pixelelectrode and the third pixel electrode.

The substrate may include a transmissive area that neighbors the firstpixel unit and the second pixel unit, and the pixel-defining layer mayinclude a hole corresponding to the transmissive area.

The first pixel electrode, the second pixel electrode, and the thirdpixel electrode each may include a reflective layer.

The above and other aspects, features, and advantages of certainembodiments of the disclosure will be more apparent from the followingdescription, claims, and the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

The above and other aspects, features, and advantages of certainembodiments of the disclosure will be more apparent from the followingdescription taken in conjunction with the accompanying drawings, inwhich:

FIG. 1 is a plan view of a display device according to an embodiment;

FIG. 2 is a view of a display element and a pixel circuit connectedthereto, the display element being arranged in one of the pixel areas ofa display device according to an embodiment;

FIG. 3 is a plan view of a portion of a display device according to anembodiment;

FIG. 4 is a cross-sectional view of the display device taken along lineIV-IV′ of FIG. 3;

FIG. 5 is a cross-sectional view of the display device taken along lineV-V′ of FIG. 3;

FIG. 6 is a plan view of a portion of a display device according to anembodiment;

FIG. 7 is a plan view of a portion of a display device according to anembodiment;

FIGS. 8, 9 and 10 are plan views of a portion of a display deviceaccording to an embodiment;

FIG. 11 is a cross-sectional view of a portion of a display deviceaccording to an embodiment;

FIG. 12 is a perspective view of a display device according to anembodiment;

FIG. 13 is a cross-sectional view of the display device taken along lineXIII-XIII' of FIG. 12;

FIG. 14 is a perspective view of a display device according to anembodiment;

FIG. 15 is a cross-sectional view of a portion of the display device ofFIG. 14; and

FIG. 16 is a perspective view of a display device according to anembodiment.

DETAILED DESCRIPTION

Reference will now be made in detail to embodiments, examples of whichare illustrated in the accompanying drawings, wherein like referencenumerals refer to like elements throughout. In this regard, the presentembodiments may have different forms and should not be construed asbeing limited to the descriptions set forth herein. Accordingly, theembodiments are merely described below, by referring to the figures, toexplain aspects of the present description. As used herein, the term“and/or” includes any and all combinations of one or more of theassociated listed items. Throughout the disclosure, the expression “atleast one of a, b or c” indicates only a, only b, only c, both a and b,both a and c, both b and c, all of a, b, and c, or variations thereof.

Hereinafter, the disclosure will be described more fully with referenceto the accompanying drawings, in which example embodiments of thedisclosure are shown. When description is made with reference to thedrawings, like reference numerals in the drawings denote like orcorresponding elements, and repeated description thereof will beomitted.

It will be understood that although the terms “first”, “second”, etc.may be used herein to describe various components, these componentsshould not be limited by these terms. These components are only used todistinguish one component from another.

As used herein, the singular forms “a”, “an” and “the” are intended toinclude the plural forms as well, unless the context clearly indicatesotherwise.

It will be further understood that the terms “comprises/includes” and/or“comprising/including” used herein specify the presence of statedfeatures or components, but do not preclude the presence or addition ofone or more other features or components.

It will be understood that when a layer, region, or component isreferred to as being “formed on” another layer, region, or component, itcan be directly or indirectly formed on the other layer, region, orcomponent. That is, for example, intervening layers, regions, orcomponents may be present.

Sizes of elements in the drawings may be exaggerated for convenience ofexplanation. In other words, since sizes and thicknesses of componentsin the drawings are arbitrarily illustrated for convenience ofexplanation, the following embodiments are not limited thereto.

When a certain embodiment may be implemented differently, a specificprocess order may be performed differently from the described order. Forexample, two consecutively described processes may be performedsubstantially at the same time or performed in an order opposite to thedescribed order.

It will be understood that when a layer, region, or component isreferred to as being “connected” to another layer, region, or component,it may be “directly connected” to the other layer, region, or componentor may be “indirectly connected” to the other layer, region, orcomponent with other layer, region, or component interposedtherebetween. For example, it will be understood that when a layer,region, or component is referred to as being “electrically connected” toanother layer, region, or component, it may be “directly electricallyconnected” to the other layer, region, or component or may be“indirectly electrically connected” to other layer, region, or componentwith other layer, region, or component interposed therebetween.

In the following examples, the x-axis, the y-axis and the z-axis are notlimited to three axes of the rectangular coordinate system, and may beinterpreted in a broader sense. For example, the x-axis, the y-axis, andthe z-axis may be perpendicular to one another, or may representdifferent directions that are not perpendicular to one another.

FIG. 1 is a plan view of a display device 10 according to an embodiment.

Referring to FIG. 1, the display device 10 may include a display area DAand a non-display area NDA that neighbors the display area DA. Thedisplay device 10 includes a plurality of pixel areas P arranged in thedisplay area DA. A display element may be disposed in each of the pixelareas P. The display element may emit light of a predetermined color. Inthe present specification, a pixel area P denotes an emission area thatemits light having a predetermined color. The display element may beelectrically connected to a pixel circuit which is electricallyconnected scan line SL and a data line DL. FIG. 1 shows a substrate 100of the display device 10 according to an embodiment. For example, thesubstrate 100 may include the display area DA and the non-display areaNDA.

A scan driver 1100, a data driver 1200, and a main power line may bedisposed in the non-display area NDA. The scan driver 1100 may provide ascan signal to each pixel circuit through a scan line SL, the datadriver 1200 may provide a data signal to each pixel circuit through adata line DL, and the main power line may provide a first power voltageor a second power voltage to each pixel circuit.

Though it is shown in FIG. 1 that the data driver 1200 is arranged onthe substrate 100, the data driver 1200 may be disposed on a flexibleprinted circuit board (FPCB) electrically connected to a pad arranged onone side of the display device 10 in another embodiment.

The display device 10 according to an embodiment may include an organiclight-emitting display, an inorganic light-emitting display, and aquantum dot display. Though a display device according to an embodimentis described as an organic light-emitting display device as an example,a display device according to the present disclosure is not limitedthereto and characteristics described below are applicable to varioustypes of display devices.

FIG. 2 is a view of a display element and a pixel circuit PC connectedthereto, according to an embodiment.

Referring to FIG. 2, an organic light-emitting diode OLED, which is adisplay element, is connected to the pixel circuit PC. The pixel circuitPC may include a first thin film transistor T1, a second thin filmtransistor T2, and a storage capacitor Cst. The organic light-emittingdiode OLED may emit, for example, red, green, or blue light or emit red,green, blue, or white light.

The second thin film transistor T2 may be a switching thin filmtransistor and is connected to a scan line SL and a data line DL. Thesecond thin film transistor T2 transfers a data voltage input throughthe data line DL to the first thin film transistor T1 in response to aswitching voltage input through the scan line SL. The storage capacitorCst may be connected to the second thin film transistor T2 and a drivingvoltage line PL and may store a voltage corresponding to a differencebetween a voltage transferred from the second thin film transistor T2and a first power voltage ELVDD supplied through the driving voltageline PL.

The first thin film transistor T1 may be a driving thin film transistor,be connected to the driving voltage line PL and the storage capacitorCst and may control a driving current flowing through the organiclight-emitting diode OLED from the driving voltage line PL in responseto the voltage stored in the storage capacitor Cst. The organiclight-emitting diode OLED may emit light having a predeterminedbrightness according to the driving current. An opposite electrode (e.g.a cathode) of the organic light-emitting diode OLED may receive a secondpower voltage ELVSS.

Though it is described in FIG. 2 that the pixel circuit PC includes twothin film transistors and one storage capacitor, the number of thin filmtransistors and the number of storage capacitors may be variouslychanged depending on a design of the pixel circuit PC in anotherembodiment.

FIG. 3 is a plan view of a portion of a display device according to anembodiment.

The display area DA may include a transmissive area TA. In anembodiment, as shown in FIG. 3, the display area DA may include aplurality of transmissive areas TA, and neighboring transmissive areasTA may be apart from each other.

The transmissive area TA is an area in which a display element is notarranged. For example, a layer(s) constituting an organic light-emittingdiode, which is a display element, is not arranged in the transmissivearea TA. Elements of a pixel circuit connected to the organiclight-emitting diode, for example, a thin film transistor and a storagecapacitor are not arranged in the transmissive area TA.

At least one pixel unit PU may be arranged between neighboringtransmissive areas TA. For example, as shown in FIG. 3, four pixel unitsPU may be arranged between neighboring transmissive areas TA.

Each pixel unit PU may include at least two pixel areas. In anembodiment, a first pixel unit PU1 may include a blue pixel area Pb anda green pixel area Pg, and a second pixel unit PU2 may include a redpixel area Pr and a green pixel area Pg. In the present specification, apixel area may be an emission area that emits light having apredetermined color as described above. That is, as shown in FIG. 3, ablue pixel area Pb is a blue emission area that emits blue light, agreen pixel area Pg is a green emission area that emits green light, anda red pixel area Pr is a red emission area that emits red light.

Pixel areas arranged in the display area DA may have a structure inwhich blue and green pixel areas Pb and Pg, and red and green pixelareas Pr and Pg are arranged in a pentile type. For example, pentiletype blue, green, red, and green pixel areas Pb, Pg, Pr, and Pg may bearranged in the display area DA. In some embodiment, the first pixelunit PU1 and the second pixel unit PU2 are alternatively arranged alongthe x-direction and the y-direction in the display area DA.

In an embodiment, as shown in FIG. 3, adjacent green pixel areas Pg maybe arranged in the x-direction and the y-direction. Adjacent blue pixelareas Pb may be arranged in a first oblique direction that is obliquewith respect to x and y directions. Likewise, Adjacent red pixel areasPr may be arranged in a second oblique direction that is oblique withrespect to x and y directions. A blue pixel area Pb and a red pixel areaPr that is adjacent to each other may be arranged in the x-direction andthe y-direction. In some embodiment, locations between the blue pixelarea Pr and the red pixel area Pr may be changed each other. Forexample, the first pixel unit PU1 may include the red and green pixelareas Pr and Pg, and the second pixel unit PU2 may include the blue andgreen pixel areas Pb and Pg. That is, the locations the first and secondpixel unit PU1 and PU2 may be changed each other.

An organic light-emitting diode, which is a display element, is locatedin each pixel areas included in each pixel unit PU. The organiclight-emitting diode including a pixel electrode, an emission layer, andan opposite electrode. Though a pixel electrode of an organiclight-emitting diode is disposed for each pixel area, an oppositeelectrode may be arranged for each pixel unit PU. For example, two pixelelectrodes are arranged to respectively correspond to blue and greenpixel areas Pb and Pg in a first pixel unit PU1 of FIG. 3. In contrast,a first opposite electrode 230-1 may be arranged to cover the blue andgreen pixel areas Pb and Pg included in the first pixel unit PU1.Similarly, two pixel electrodes are arranged to respectively correspondto red and green pixel areas Pr and Pg in a second pixel unit PU2. Incontrast, a second opposite electrode 230-2 may be arranged tocorrespond to the second pixel unit PU2, for example, to cover the redand green pixel areas Pr and Pg included in the second pixel unit PU2.

The first opposite electrodes 230-1 and the second opposite electrodes230-2 are alternately arranged. For example, a second opposite electrode230-2 may be arranged between the first opposite electrodes 230-1 thatneighbor each other in an x-direction and a y-direction, and a firstopposite electrode 230-1 may be arranged between the second oppositeelectrodes 230-2 that neighbor each other in the x-direction and they-direction.

End portions of the opposite electrodes that neighbor each other, forexample, the first opposite electrodes 230-1 and the second oppositeelectrodes 230-2 may overlap each other and thus be electricallyconnected to each other. Each opposite electrode may be patterned byusing a mask including an opening provided to a location at which theopposite electrode is to be formed. For example, the first oppositeelectrodes 230-1 are patterned first by using a mask, and then the maskis moved and the second opposite electrodes 230-2 may be patterned byusing the mask. Alternatively, the second opposite electrode 230-2 maybe patterned by using a second mask different from a first mask that isused for forming the first opposite electrodes 230-1.

As described above, because the first opposite electrodes 230-1 and thesecond opposite electrodes 230-2 are individually formed, the oppositeelectrode is not arranged in the transmissive area TA, and thus thetransmittance of the transmissive area TA may be improved. As acomparative example, in the case where an opposite electrode formed asone body is disposed so as to cover the display area DA, because aportion of the opposite electrode formed as one body covers thetransmissive area TA, the transmittance of the transmissive area TA isgreatly reduced. In contrast, according to the present disclosure, asdescribed above, because each of the opposite electrodes is arranged foreach predetermined unit (for example, because each opposite electrode isarranged for each pixel unit), the transmittance of the transmissivearea TA may be sufficiently secured.

A distance between neighboring pixel areas in each pixel unit PU may beless than a distance between pixel areas disposed in different pixelunits PU neighboring the each pixel unit PU. For example, a distancebetween a first pixel area and a second pixel area included in one ofthe pixel units PU may be less than a distance between the first pixelarea of the one pixel unit PU and a third pixel area of neighboringanother pixel unit PU (here, the first pixel area neighbors the thirdpixel area).

In an embodiment, as shown in FIG. 3, a first distance d1 between a bluepixel area Pb and a green pixel area Pg of the first pixel unit PU1 isless than a second distance d2 between the green pixel area Pg of thefirst pixel unit PU1 and a red pixel area Pr of the second pixel unitPU2. Here, the green pixel area Pg of the first pixel unit PU1 neighborsthe red pixel area Pr of the second pixel unit PU2. Likewise, a firstdistance d1 between the blue pixel area Pb and the green pixel area Pgof the first pixel unit PU1 is less than a third distance d3 between theblue pixel area Pb of the first pixel unit PU1 and a green pixel area Pgof a third pixel unit PU3. Here, the blue pixel area Pb of the firstpixel unit PU1 neighbors the green pixel area Pg of the third pixel unitPU3. In the present specification, a distance between neighboring pixelareas means a shortest distance between the neighboring pixel area. Forpreventing short-circuit between the pixel electrodes 210 that neighboreach other, the first distance d1 may be about at least 10 μm. In anembodiment, the first distance d1 may be about at least 15 μm.

As described above, when the first distance d1 is less than the seconddistance d2 and the third distance d3, a margin in a process ofpatterning the first opposite electrode 230-1 and the second oppositeelectrode 230-2 may be secured, and sufficient contact between the firstopposite electrode 230-1 and the second opposite electrode 230-2 may besufficiently secured.

FIGS. 4 and 5 are views of a portion of a display device according to anembodiment, FIG. 4 corresponds to a cross-section of the display devicetaken along line IV-IV′ of FIG. 3A, and FIG. 5 corresponds to across-section of the display device taken along line V-V′ of FIG. 3.

An organic light-emitting diode is arranged in each pixel area. Withregard to this, FIGS. 4 and 5 show thin film transistors TFT, forexample, a driving thin film transistor T1 in FIG. 2, and organiclight-emitting diodes OLEDb, OLEDg, and OLEDr connected to the thin filmtransistors TFT, the thin film transistors TFT and the organiclight-emitting diodes OLEDb, OLEDg, and OLEDr being arranged over asubstrate 100, and being elements of a pixel circuit.

The substrate 100 may include glass or a polymer resin. The polymerresin may include polyethersulfone (PES), polyacrylate, polyetherimide(PEI), polyethylene naphthalate (PEN), polyethylene terephthalate (PET),polyphenylene sulfide (PPS), polyarylate (PAR), polyimide (PI),polycarbonate (PC), and/or cellulose acetate propionate (CAP). Thesubstrate 100 including the polymer resin may be flexible, rollable, orbendable. The substrate 100 may have a multi-layered structure includinga layer including a polymer resin, and an inorganic layer (not shown).

The thin film transistor TFT may include a semiconductor layer ACT, agate electrode GE, a source electrode SE, and a drain electrode DE, thesemiconductor layer ACT including amorphous silicon, polycrystallinesilicon, or an organic semiconductor material. To secure insulationbetween the semiconductor layer ACT and the gate electrode GE, a gateinsulating layer 121 may be disposed between the semiconductor layer ACTand the gate electrode GE, the gate insulating layer 121 including aninorganic material such as silicon oxide, silicon nitride and/or siliconoxynitride. An interlayer insulating layer 131 may be disposed on thegate electrode GE, the interlayer insulating layer 131 including aninorganic material such as silicon oxide, silicon nitride and/or siliconoxynitride. The source electrode SE and the drain electrode DE may bedisposed on the interlayer insulating layer 131. The insulating layerincluding an inorganic material may be formed by chemical vapordeposition (CVD) or atomic layer deposition (ALD).

The gate electrode GE, the source electrode SE, and the drain electrodeDE may include various conductive materials. The gate electrode GE mayinclude molybdenum or aluminum, and when needed, may have amulti-layered structure. For example, the gate electrode GE may includea single layer of molybdenum or have a three-layered structure includinga molybdenum layer, an aluminum layer, and a molybdenum layer. Thesource electrode SE and the drain electrode DE may include titanium oraluminum, and when needed, have a multi-layered structure. In anembodiment, the source electrode SE and the drain electrode DE may havea three-layered structure including a titanium layer, an aluminum layer,and a titanium layer.

A buffer layer 110 may be disposed between the thin film transistor TFThaving the above-described structure and the substrate 100, the bufferlayer 110 including an inorganic material such as silicon oxide, siliconnitride, and/or silicon oxynitride. The buffer layer 110 may increaseflatness of a top surface of the substrate 100 and/or prevent orminimize the penetration of impurities into the semiconductor layer ACTof the thin film transistor TFT from the substrate 100.

A planarization insulating layer 140 may be disposed on the thin filmtransistor TFT. The planarization insulating layer 140 may include anorganic material such as acryl, benzocyclobutene (BCB), orhexamethyldisiloxane (HMDSO). Though it is shown in FIG. 4 that theplanarization insulating layer 140 includes a single layer, theplanarization insulating layer 140 may include a multi-layer whichincludes an inorganic material and/or an organic material.

The thin film transistor TFT may have the same structure for each pixelcircuit. For example, as shown in FIG. 4, each of thin film transistorsTFT of a pixel circuit corresponding to a green pixel area Pg may havethe same structure as that of a thin film transistor TFT of a pixelcircuit corresponding to a blue pixel area Pb. Also, a thin filmtransistor TFT of a pixel circuit corresponding to a red pixel area Prshown in FIG. 5 may have the same structure as that of a thin filmtransistor TFT of a pixel circuit corresponding to a blue pixel area Pb.

The thin film transistors TFT are respectively connected to the organiclight-emitting diodes OLEDb, OLEDg, and OLEDr. For example, as shown inFIGS. 4 and 5, each of the organic light-emitting diode OLEDb that emitsblue light, the organic light-emitting diode OLEDg that emits greenlight, and the organic light-emitting diode OLEDr that emits red lightis connected to a respective thin film transistor TFT.

The pixel electrode 210 of each of the organic light-emitting diodesOLEDb, OLEDg, and OLEDr may be disposed on the planarization insulatinglayer 140. The pixel electrodes 210 may be spaced apart from each otherand each of the pixel electrodes 210 may have an island shape. The pixelelectrode 210 may include a (semi) transparent electrode or a reflectiveelectrode. In an embodiment, the pixel electrode 210 may include areflective electrode and a transparent or semi-transparent electrodelayer disposed on the reflective layer, the reflective electrodeincluding at least one of Ag, Mg, Al, Pt, Pd, Au, Ni, Nd, Jr, Cr, or acompound thereof. The transparent or semi-transparent electrode layermay include at least one of indium tin oxide (ITO), indium zinc oxide(IZO), zinc oxide (ZnO), or indium oxide (In₂O₃), indium gallium oxide(IGO), or aluminum zinc oxide (AZO). In an embodiment, the pixelelectrode 210 may have a three-layered structure of an ITO layer, an Aglayer, and an ITO layer.

A pixel-defining layer 150 is disposed on the pixel electrode 210. Thepixel-defining layer 150 includes an opening 150OP exposing a centralportion of each pixel electrode 210, the opening 150OP corresponding toan emission area. The pixel-defining layer 150 may prevent an arc, etc.from occurring at the edges of the pixel electrode 210 by increasing adistance between the opposite electrodes (e.g. the first oppositeelectrode 230-1 and the second opposite electrode 230-2) and the edgesof the pixel electrode 210. The pixel-defining layer 150 may include anorganic insulating material such as polyimide, polyamide, an acrylicresin, BCB, HMDSO, or a phenolic resin, and may be formed by a methodsuch as spin coating.

An emission layer may be disposed on a portion of the pixel electrode210 that is exposed through the opening 150OP of the pixel-defininglayer 150. A blue emission layer 1 220 b is disposed on the pixelelectrode 210 corresponding to the blue pixel area Pb, a green emissionlayer 220 g is disposed on the pixel electrode 210 corresponding to thegreen pixel area Pg, and a red emission layer 220 r is disposed on thepixel electrode 210 corresponding to the red pixel area Pr. The blueemission layer 220 b may include an organic material including afluorescent or phosphorous material that may emit blue light, the greenemission layer 220 g may include an organic material including afluorescent or phosphorous material that may emit green light, and thered emission layer 220 r may include an organic material including afluorescent or phosphorous material that may emit red light. The organicmaterial that emits red, green, or blue light may include a lowmolecular weight organic material or a polymer organic material.

A first functional layer and a second functional layer may berespectively disposed on and under the blue emission layer 220 b, thegreen emission layer 220 g, and the red emission layer 220 r. The firstfunctional layer may include a hole transport layer and/or a holeinjection layer, and the second functional layer may include an electroninjection layer and/or an electron transport layer. The first functionallayer and the second functional layer may be formed as one body so as toentirely cover the display area DA. Therefore, the transmissive area TAmay be covered by the first functional layer and the second functionallayer. Alternatively, the first functional layer and the secondfunctional layer may include an opening corresponding to thetransmissive area TA. The first functional layer and the secondfunctional layer may be selectively provided depending on necessity. Forexample, in an embodiment, both the first functional layer and thesecond functional layer may be provided, and in another embodiment, thesecond functional layer may be omitted.

The opposite electrodes, for example, the first opposite electrode 230-1and the second opposite electrode 230-2 may be alternately disposed andrespectively arranged so as to cover pixel areas of a correspondingpixel unit. For example, as shown in FIGS. 3 to 5, one of the firstopposite electrodes 230-1 may cover a blue pixel area Pb and a greenpixel area Pg of the first pixel unit PUL Similarly, one of the secondopposite electrodes 230-2 may cover a red pixel area Pr and a greenpixel area Pg of the second pixel unit PU2 (see FIG. 3). With regard tothis, FIG. 5 shows that the second opposite electrode 230-2 disposed onthe red emission layer 220 r. Because the first opposite electrodes230-1 and the second opposite electrodes 230-2 are alternately arrangedas described above, the second opposite electrode 230-2 different fromthe second opposite electrode 230-2 shown in FIG. 5 is disposed so as tocover pixel areas of the third pixel unit PU3 as shown in FIG. 4.

The first opposite electrodes 230-1 and the second opposite electrodes230-2 may include a (semi) transparent layer including at least one ofAg, Mg, Al, Pt, Pd, Au, Ni, Nd, Ir, Cr, Li, Ca, or an alloy thereof.Alternatively, the first opposite electrodes 230-1 and the secondopposite electrodes 230-2 may further include a layer including ITO,IZO, ZnO, or In₂O₃ on the (semi) transparent layer including the abovematerial. In an embodiment, each of the first opposite electrodes 230-1and the second opposite electrodes 230-2 may include Ag, Mg, or an alloyof Ag and Mg.

Because the first opposite electrode 230-1 and the second oppositeelectrode 230-2 are respectively arranged in neighboring pixel units,the first opposite electrode 230-1 and the second opposite electrode230-2 may overlap each other to be electrically connected to each other.For example, the first opposite electrode 230-1 of the first pixel unitPU1 may directly contact and overlap the second opposite electrode 230-2of the third pixel unit PU3 in a region disposed between the first pixelunit PU1 and the third pixel unit PU3 (see FIG. 4). The first oppositeelectrode 230-1 of the first pixel unit PU1 may directly contact andoverlap the second opposite electrode 230-2 of the second pixel unit PU2in a region between the first pixel unit PU1 and the second pixel unitPU2 (see FIG. 5).

Because the first opposite electrode 230-1 and the second oppositeelectrode 230-2 are patterned so as to correspond to respective pixelunits, the first opposite electrode 230-1 and the second oppositeelectrode 230-2 may not be located in the transmissive area TA as shownin FIGS. 3 and 5. Similarly, a material corresponding to thepixel-defining layer 150 may not be located in the transmissive area TA.For example, the pixel-defining layer 150 may include a hole 150H inareas corresponding to the transmissive area TA.

Though FIG. 5 shows the hole 150H formed in areas corresponding to thetransmissive area TA formed by patterning the pixel-defining layer 150,the at least one layer including the buffer layer 110, the gateinsulating layer 121, the interlayer insulating layer 131, and theplanarization insulating layer 140 in the transmissive area TA may alsobe removed in another embodiment. For example, at least one of thebuffer layer 110, the gate insulating layer 121, the interlayerinsulating layer 131, and the planarization insulating layer 140 mayinclude holes in areas corresponding to the transmissive area TA.

An edge 230E of the opposite electrode (e.g. the first oppositeelectrode 230-1 of FIG. 5) that neighbors the transmissive area TA maybe disposed adjacent to an edge 150E of the pixel-defining layer 150. Inan embodiment, the edge 230E of the opposite electrode (e.g. the firstopposite electrode 230-1 of FIG. 5) that is disposed adjacent to thetransmissive area TA may further extend toward the transmissive area TAbeyond the edge 150E of the pixel-defining layer 150 that is disposedadjacent to the transmissive area TA, and may contact an insulatinglayer, for example, the planarization insulating layer 140 disposedunder the pixel electrode 210. In another embodiment, the edge 230E ofthe opposite electrode (e.g. the first opposite electrode 230-1 of FIG.5) that is disposed adjacent to the transmissive area TA may be locatedon the same vertical line as that of the edge 150E of the pixel-defininglayer 150 that is disposed adjacent to the transmissive area TA. Inanother embodiment, the edge 150E of the pixel-defining layer 150 thatis disposed adjacent to the transmissive area TA may extend furthertoward the transmissive area TA than the edge 230E of the oppositeelectrode (e.g. the first opposite electrode 230-1 of FIG. 5) that isdisposed adjacent to the transmissive area TA.

A shortest distance between pixel areas (e.g., neighboring or adjacentpixel areas) of the first pixel unit PU1, for example, a first distanced1 between the green pixel area Pg and the blue pixel area Pb,corresponds to a distance between an emission area of the green organiclight-emitting diode OLEDg and an emission area of the blue organiclight-emitting diode OLEDb. Because an emission area of each organiclight-emitting diode is substantially the same as the opening 150OP ofthe pixel-defining layer 150, the first distance d1 may be a width of aportion of the pixel-defining layer 150 located between the greenorganic light-emitting diode OLEDg and the blue organic light-emittingdiode OLEDb.

The first distance d1 between neighboring pixel areas of the first pixelunit PU1 is less than a distance between one of the pixel areas of thefirst pixel unit PU1 and a pixel area of the second pixel unit PU2 orthe third pixel unit PU3 that is disposed adjacent to the first pixelunit PU1.

For example, referring to FIGS. 3 and 4, among pixel areas disposed indifferent pixel units PU, the green pixel area Pg of the third pixelunit PU3 are disposed closest to the blue pixel areas Pb of the firstpixel unit PU1, and the third distance d3 between the blue pixel area Pbof the first pixel unit PU1 and the green pixel area Pg of the thirdpixel unit PU3 is greater than the first distance d1. The third distanced3 corresponds to a shortest distance between emission areas ofneighboring organic light-emitting diodes disposed in neighboring pixelunits. Because the emission area is defined by the opening 150OP of thepixel-defining layer 150, the third distance d3 may be a width of aportion of the pixel-defining layer 150 disposed between the blueorganic light-emitting diode OLEDb of the first pixel unit PU1 and thegreen organic light-emitting diode OLEDg of the third pixel unit PU3.

Similarly, referring to FIGS. 3 and 5, among pixel areas disposed indifferent pixel units PU, the green pixel area Pg of the first pixelunit PU1 and the red pixel area Pr of the second pixel unit PU2 aredisposed closest to each other, and the second distance d2 between thegreen pixel area Pg of the first pixel unit PU1 and the red pixel areaPr of the second pixel unit PU2 is greater than the first distance d1.The second distance d2 corresponds to a shortest distance betweenemission areas of neighboring organic light-emitting diodes disposed inneighboring pixel units. Because the emission area is defined by theopening 150OP of the pixel-defining layer 150, the second distance d2may be a width of a portion of the pixel-defining layer 150 disposedbetween the green organic light-emitting diode OLEDg of the first pixelunit PU1 and the red organic light-emitting diode OLEDr of the secondpixel unit PU2. The second distance d2 may be the same as or differentfrom the third distance d3.

As described above, because the second distance d2 and the thirddistance d3 are greater than the first distance d1, despite misalignmentthat may occur during the first opposite electrode 230-1 and the secondopposite electrode 230-2 are patterned, an area and/or a width of anoverlapping area CTA of the first opposite electrode 230-1 and thesecond opposite electrode 230-2 may be sufficiently secured. Theoverlapping area CTA of the first opposite electrode 230-1 and thesecond opposite electrode 230-2 overlaps a portion of the pixel-defininglayer 150 (that excludes the opening 150OP of the pixel-defining layer150 and has a predetermined volume), and does not overlap the opening150OP of the pixel-defining layer 150.

The first opposite electrode 230-1 may include the same material as thatof the second opposite electrode 230-2. Depending on the condition underwhich the first opposite electrode 230-1 and the second oppositeelectrode 230-2 are formed, an interface between the first oppositeelectrode 230-1 and the second opposite electrode 230-2 in theoverlapping area CTA may be recognized or may not be recognized by aSEM(Scanning electron microscope) or TEM (transmission electronmicroscopy) image. Even if where the interface is difficult to berecognized, a portion having a thickness which is greater than thethickness of the first opposite electrode 230-1 or a thickness of thesecond opposite electrode 230-2 may be the overlapping area CTA. Thatis, a thickness of the overlapping area CTA may be sum of a thickness ofthe first opposite electrode 230-1 and a thickness of the secondopposite electrode 230-2.

A shortest gap between pixel electrodes disposed in one pixel unit maybe less than a shortest gap between pixel electrodes disposed inneighboring pixel units. For example, as shown in FIG. 4, a first gapPd1 between the pixel electrodes 210 of the blue organic light-emittingdiode OLEDb and the green organic light-emitting diode OLEDg in thefirst pixel unit PU1 may be less than a third gap Pd3 between the pixelelectrodes 210 of a blue organic light-emitting diode OLEDb in the firstpixel unit PU1 and the pixel electrode 210 of a green organiclight-emitting diode OLEDg in the third pixel unit PU3. Similarly, asshown in FIG. 5, a first gap Pd1 between the pixel electrodes 210 of theblue organic light-emitting diode OLEDb and the green organiclight-emitting diode OLEDg in the first pixel unit PU1 may be less thana second gap Pd2 between a pixel electrode 210 of a green organiclight-emitting diode OLEDg in the first pixel unit PU1 and a pixelelectrode 210 of a red organic light-emitting diode OLEDr in the secondpixel unit PU2 which is disposed adjacent to the first pixel unit PU1.

FIG. 6 is a plan view of a portion of a display device according to anembodiment. Though it is described in FIGS. 3 to 5 that one pixel unitincludes two pixel areas, the embodiment is not limited thereto. Asshown in FIG. 6, each pixel unit PU′ may include four pixel areas, thatis, blue, green, red, and green pixel areas. For example, each of afirst pixel unit PU1′ and a second pixel unit PU2′ may include red,green, blue, and green pixel areas Pr, Pg, Pb, and Pg.

A first opposite electrode 230-1′ or a second opposite electrode 230-2′may be disposed in each of a plurality of pixel units PU′. For example,the first opposite electrode 230-1′ may be disposed in the first pixelunit PU1′, and the second opposite electrode 230-2′ may be disposed inthe second pixel unit PU2′. In other words, a group of the pixel areascorresponding to the first opposite electrode 230-1′ may be the firstpixel unit PU1′, and a group of the pixel areas corresponding to thesecond opposite electrode 230-2′ may be the second pixel unit PU2′.

Because the first pixel unit PU1′ neighbors the second pixel unit PU2′,the first opposite electrode 230-1′ may neighbor and overlap the secondopposite electrode 230-2′ as described above.

Since the first distance d1 between neighboring pixel areas included ineach pixel unit PU′ is less than the second distance d2 betweenneighboring pixel areas selected from neighboring pixel units PU′.Therefore, an overlapping area and a contact area of the first oppositeelectrode 230-1′ and the second opposite electrode 230-2′ may besufficiently secured. For example, the first distance d1 betweenneighboring pixel areas among blue, green, red, and green pixel areasPb, Pg, Pr, and Pg of the first pixel unit PU1′ is less than the seconddistance d2 between one pixel area (e.g. a blue pixel area Pb) of thefirst pixel unit PU1′ and one pixel area (e.g. a green pixel area Pg) ofthe second pixel unit PUT which is disposed adjacent to the first pixelunit PU1′.

FIG. 7 is a plan view of a portion of a display device according toanother embodiment. Though it is described in FIGS. 3 to 5 that onepixel unit includes two pixels and it is described in FIG. 6 that onepixel unit includes four pixels, the embodiment is not limited thereto.As shown in FIG. 7, each pixel unit PU″ may include three pixel areas,that is, red, green, and blue pixel areas Pr, Pg, and Pb. For example,each of a first pixel unit PU1″ and a second pixel unit PU2″ may includered, green, and blue pixel areas Pr, Pg, and Pb.

A first opposite electrode 230-1″ or a second opposite electrode 230-2″may be arranged in each of a plurality of pixel units″. For example, thefirst opposite electrode 230-1″ may be disposed in the first pixel unitPU1″, and the second opposite electrode 230-2″ may be disposed in thesecond pixel unit PU2″. Because the first pixel unit PU1″ is disposedadjacent to the second pixel unit PU2″, the first opposite electrode230-1″ may be disposed adjacent to the second opposite electrode 230-2″and end portions of the first opposite electrode 230-1″ and the secondopposite electrode 230-2″ may overlap each other.

Because the first distance d1 between neighboring pixel areas includedin each pixel unit PU″ is less than the second distance d2 betweenneighboring pixel areas disposed in adjacent pixel units PU″. Therefore,an overlapping area and a contact area of the first opposite electrode230-1″ and the second opposite electrode 230-2″ may be sufficientlysecured. For example, the first distance d1 between neighboring pixelareas among red, green, and blue pixel areas Pr, Pg, and Pb of the firstpixel unit PU1″ is less than the second distance d2 between one pixelarea (e.g. a blue pixel area Pb) of the first pixel unit PU1″ and onepixel area (e.g. a red pixel area Pr) of the second pixel unit PU2″which is disposed adjacent to the first pixel unit PU1″. Similarly, thefirst distance d1 between neighboring pixel areas among red, green, andblue pixel areas Pr, Pg, and Pb of the first pixel unit PU1″ is lessthan the third distance d3 between one pixel area (e.g. a blue pixelarea Pb) of the first pixel unit PU1″ and one pixel area (e.g. a bluepixel area Pb) of the third pixel unit PU3″ which is disposed adjacentto the first pixel unit PU1″. The second distance d2 may be the same asor different from the third distance d3.

FIGS. 8 to 10 are plan views of a portion of a display device accordingto an embodiment, respectively.

Referring to FIGS. 8 and 9, the display area DA includes a plurality oftransmissive areas TA, the transmissive areas TA being alternatelyarranged. The transmissive areas TA may be locally arranged in a portionof the display area DA as shown in FIG. 8, or may be alternatelyarranged with groups of pixel units over the entire display area DA asshown in FIG. 9. Referring to FIG. 10, the display area DA may includeone transmissive area TA. One transmissive area TA may be locallylocated in a portion of the display area DA.

Pixel areas are not arranged in the transmissive area TA, and the firstopposite electrodes 230-1 and the second opposite electrodes 230-2 maybe alternately arranged in an area of the display area DA in which pixelareas are arranged.

Though it is shown in FIGS. 8 to 10 that each pixel unit includes twopixel areas, for example, the blue and green pixel areas Pb and Pg, orthe green or red pixel areas Pr and Pg as described with reference toFIG. 3, each pixel unit may include four or three pixel areas asdescribed with reference to FIGS. 6 and 7 in another embodiment.

FIG. 11 is a cross-sectional view of a portion of a display deviceaccording to an embodiment.

Referring to FIG. 11, a thin film transistor TFT is disposed over thesubstrate 100, and an organic light-emitting diode OLED is connected tothe thin film transistor TFT. The organic light-emitting diode OLEDincludes the pixel electrode 210, an emission layer 220, and an oppositeelectrode 230. The opposite electrode 230 of FIG. 11 may correspond tothe first opposite electrode 230-1 or the second opposite electrode230-2 described with reference to FIGS. 3 to 10.

At least one insulating layer IL is disposed between the substrate 100and the organic light-emitting diode OLED. The at least one insulatinglayer IL may include the buffer layer 110, the gate insulating layer121, the interlayer insulating layer 131, and the planarizationinsulating layer 140 described with reference to FIGS. 4 and 5.

A thin-film encapsulation layer 300 may be disposed on the organiclight-emitting diode OLED. The thin-film encapsulation layer 300 may beformed so as to entirely cover the display device 10 and may include atleast one inorganic encapsulation layer and at least one organicencapsulation layer. In an embodiment, FIG. 11 shows a first inorganicencapsulation layer 310, an organic encapsulation layer 320, and asecond inorganic encapsulation layer 330.

The first inorganic encapsulation layer 310 and the second inorganicencapsulation layer 330 may include at least one inorganic insulatingmaterial including aluminum oxide, titanium oxide, tantalum oxide,hafnium oxide, zinc oxide, silicon oxide, silicon nitride, or siliconoxynitride. The organic encapsulation layer 320 may include apolymer-based material. The polymer-based material may include PET, PEN,PC, PI, polyethylene sulfonate, polyoxymethylene, polyarylate, HMDSO, anacrylic-based resin (for example, polymethylmethacrylate, poly acrylicacid, etc.), or an arbitrary combination thereof.

In an area of the display area DA in which an organic light-emittingdiode OLED is disposed, light L_(color) having a predetermined color andemitted from the organic light-emitting diode OLED may progress towardthe outside. In contrast, in the transmissive area TA, external lightL_(external) that is not generated or emitted from the display device 10may pass through the display device 10 and progress in a direction (oran opposite direction) from a bottom side of the substrate 100 to thethin-film encapsulation layer 300.

FIG. 12 is a perspective view of a display device 10′ according toanother embodiment, and FIG. 13 is a cross-sectional view of the displaydevice 10′ taken along line XIII-XIII′ of FIG. 12.

Referring to FIG. 12, the display device 10′ may include a sensor areaSA disposed inside the display area DA. Pixel areas P and thetransmissive area TA may be disposed in the sensor area SA. At least twopixel areas P arranged in the sensor area SA may be included in onepixel unit. The arrangements of pixel units and transmissive areas TAmay be the same as the embodiment(s) described with reference to FIGS.3, 8 to 10 or embodiments derived therefrom.

Referring to FIG. 13, because a structure in which layers from thesubstrate 100 to the thin-film encapsulation layer 300 are sequentiallystacked is the same as the structure described with reference to FIG.11, a difference is mainly described below.

A component CMP may be located in the sensor area SA. The component CMPmay be an electronic element that emits and/or receives light Ls. Forexample, the component CMP may be a sensor such as an infrared sensorthat emits and/or receives light, a sensor that outputs and senses lightor sound to measure a distance or recognize a fingerprint, and a smalllamp that outputs light. An electronic element that uses light may uselight in various wavelength bands such as visible light, infrared light,and ultraviolet light.

A lower protective film 175 may be disposed on a backside of thesubstrate 100 and may include a hole 175H corresponding to the sensorarea SA. The lower protective film 175 may include PET or PI.

FIG. 14 is a perspective view of a display device 10″ according toanother embodiment, and FIG. 15 is a cross-sectional view of a portionof the display device 10″ of FIG. 14.

Referring to FIGS. 14 and 15, the display device 10″ may include ahead-up display device for a vehicle. The display device 10″ includestransmissive areas TA provided to the display area DA. A plurality ofpixel areas are arranged around the transmissive area TA, and at leasttwo pixel areas constitute one pixel unit. The characteristics andstructures of the embodiment(s) described with reference to FIGS. 3 to10 are equally applicable to the display device 10″ shown in FIGS. 14and 15.

The display device 10″ may further include an optical film 400 thatblocks light in a specific wavelength band, for example, light in awavelength band excluding a visible light band. The optical film 400 mayinclude a film that blocks light in, for example, an ultraviolet (UV)wavelength band.

As shown in FIG. 15, the optical film 400 may be disposed on thethin-film encapsulation layer 300 or disposed on the backside of thesubstrate 100. Alternatively, two optical films 400 may be respectivelydisposed on the backside of the substrate 100 and a top surface of thethin-film encapsulation layer 300.

FIG. 16 is a perspective view of a display device 10′″ according toanother embodiment.

Referring to FIG. 16, the display device 10′″ may include a speaker oran artificial intelligence speaker. At least one of surfacesconstituting the display device 10′″, for example, a lateral surface mayhave the characteristics according to the embodiments described withreference to FIGS. 3 to 11. For example, as described above, because thedisplay device 10′″ has a transmissive area, a structure provided insidethe speaker or the artificial intelligence speaker may be viewed by anexternal user.

A display device according to embodiments may improve an emissionefficiency of light emitted from a display element, improve brightness,and improve the life of the display device.

However, the scope of the present disclosure is not limited by theseeffects.

It should be understood that embodiments described herein should beconsidered in a descriptive sense only and not for purposes oflimitation. Descriptions of features or aspects within each embodimentshould typically be considered as available for other similar featuresor aspects in other embodiments. While one or more embodiments have beendescribed with reference to the figures, it will be understood by thoseof ordinary skill in the art that various changes in form and detailsmay be made therein without departing from the spirit and scope asdefined by the following claims.

What is claimed is:
 1. A display device comprising: a substrate; a firstpixel unit disposed over the substrate and including at least two pixelareas emitting lights of different colors; a second pixel unitneighboring the first pixel unit and including at least two pixel areasemitting lights of different colors; a first opposite electrode disposedon an area corresponding to the first pixel unit; and a second oppositeelectrode disposed on an area corresponding to the second pixel unit,wherein the first pixel unit includes a first pixel area and a secondpixel area that neighbor each other, the second pixel unit includes athird pixel area and a fourth pixel area that neighbor each other, and afirst distance between the first pixel area and the second pixel area isless than a second distance between the third pixel area and the firstpixel area that neighbors the third pixel area.
 2. The display device ofclaim 1, wherein the first opposite electrode is a single body coveringthe first pixel area and the second pixel area, and the second oppositeelectrode is a single body covering the third pixel area and the fourthpixel area that neighbors the third pixel area.
 3. The display device ofclaim 1, wherein an end portion of the first opposite electrode and anend portion of the second opposite electrode overlap each other.
 4. Thedisplay device of claim 3, wherein the end portion of the first oppositeelectrode directly contacts the end portion of the second oppositeelectrode.
 5. The display device of claim 3, wherein an overlapping partof the end portion of the first opposite electrode and the end portionof the second opposite electrode is disposed between the first pixelarea and the third pixel area.
 6. The display device of claim 1, whereinthe first opposite electrode and the second opposite electrode includesame material.
 7. The display device of claim 1, further comprising: afirst pixel electrode disposed in the first pixel area, a second pixelelectrode disposed in the second pixel area, and a third pixel electrodedisposed in the third pixel area; and a pixel-defining layer includingopenings respectively overlapping the first pixel electrode, the secondpixel electrode and the third pixel electrode.
 8. The display device ofclaim 7, wherein each of an edge of the first opposite electrode and anedge of the second opposite electrode is disposed on a top surface of aportion of the pixel-defining layer disposed between the first pixelelectrode and the third pixel electrode.
 9. The display device of claim7, wherein the substrate includes a transmissive area that neighbors thefirst pixel unit and the second pixel unit, and the pixel-defining layerincludes a hole corresponding to the transmissive area.
 10. The displaydevice of claim 9, wherein an edge of one of the first oppositeelectrode and the second opposite electrode neighbors an edge of thepixel-defining layer defining the hole.
 11. The display device of claim1, wherein the first pixel unit comprises the first pixel area thatcorresponds to a red pixel area and the second pixel area thatcorresponds to a green pixel area, the second pixel unit comprises thethird pixel area that corresponds to a green pixel area and neighborsthe red pixel area of the first pixel area, and the first distancebetween the red pixel area of the first pixel unit and the green pixelarea of the first pixel unit is less than the second distance betweenthe green pixel area of the second pixel unit and the red pixel area ofthe first pixel unit.
 12. The display device of claim 1, wherein thefirst pixel unit comprises the first pixel area that corresponds to ablue pixel area and the second pixel area that corresponds to a greenpixel area, the second pixel unit comprises the third pixel area thatcorresponds to a green pixel area and neighbors the blue pixel area ofthe first pixel area, and the first distance between the blue pixel areaof the first pixel unit and the green pixel area of the first pixel unitis less than the second distance between the green pixel area of thesecond pixel unit and the blue pixel area of the first pixel unit.
 13. Adisplay device comprising: a substrate; a first pixel unit disposed overthe substrate and including a first pixel area and a second pixel areaemitting lights of different colors; a second pixel unit neighboring thefirst pixel unit and including a third pixel area that neighbors thefirst pixel unit and a fourth pixel area emitting lights of differentcolors; a first pixel electrode disposed in the first pixel area; asecond pixel electrode disposed in the second pixel area that neighborsthe first pixel area; a third pixel electrode disposed in the thirdpixel area; and a pixel-defining layer including openings respectivelyoverlapping the first pixel electrode, the second pixel electrode andthe third pixel electrode, wherein a first width of a first potion ofthe pixel-defining layer that is disposed between the first pixelelectrode and the second pixel electrode is less than a second width ofa second portion of the pixel-defining layer that is disposed betweenthe first pixel electrode and the third pixel electrode.
 14. The displaydevice of claim 13, further comprising: a first opposite electrode and asecond opposite electrode that are disposed respectively correspondingto the first pixel unit and the second pixel unit, wherein the firstopposite electrode is electrically connected to the second oppositeelectrode.
 15. The display device of claim 14, wherein an end portion ofthe first opposite electrode and an end portion of the second oppositeelectrode directly contact each other.
 16. The display device of claim15, wherein the end portion of the first opposite electrode and the endportion of the second opposite electrode overlap each other.
 17. Thedisplay device of claim 15, wherein a contact area of the first oppositeelectrode and the second opposite electrode is disposed between thefirst pixel area and the third pixel area.
 18. The display device ofclaim 14, wherein the first opposite electrode and the second oppositeelectrode include same material.
 19. The display device of claim 18,wherein the first opposite electrode and the second opposite electrodeeach includes Ag, Mg, or an alloy of Ag and Mg.
 20. The display deviceof claim 13, wherein a first gap between the first pixel electrode andthe second pixel electrode is less than a second gap between the firstpixel electrode and the third pixel electrode.
 21. The display device ofclaim 13, wherein the substrate includes a transmissive area thatneighbors the first pixel unit and the second pixel unit, and thepixel-defining layer includes a hole corresponding to the transmissivearea.
 22. The display device of claim 13, wherein the first pixelelectrode, the second pixel electrode, and the third pixel electrodeeach include a reflective layer.
 23. The display device of claim 13,wherein the first pixel area of the first pixel unit is a red pixel areaor a blue pixel area, the second pixel area of the first pixel unit is agreen pixel area, and the third pixel area of the second pixel unit is agreen pixel area.